COMPARATIVE EVALUATION OF THE SHEAR BOND STRENGTH OF METAL BRACKETS BONDED TO PORCELAIN USING DIFFERENT PORCELAIN SURFACE TREATMENTS

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ESLAMI AMIRABADI GH.; MAHVIDIZADEH S.; NASIRI M.

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Journal: Journal of Dental Medicine Year:2011 | Volume:24 | Issue:1 (66) Page(s): 26-35

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Title

COMPARATIVE EVALUATION OF THE SHEAR BOND STRENGTH OF METAL BRACKETS BONDED TO PORCELAIN USING DIFFERENT PORCELAIN SURFACE TREATMENTS

Author(s)

ESLAMI AMIRABADI GH. | MAHVIDIZADEH S. | NASIRI M. | Issue Writer Certificate

Keywords

SILANEQ3

SHEAR STRENGTHQ2

DENTAL PORCELAINQ2

HYDROFLUORIC ACIDQ2

Abstract

Background and Aims: The aim of this in vitro study was to compare shear bond strength of metal brackets bonded to DENTAL PORCELAIN on the basis of presence or absence of SILANE, type of acid [hydrofluoric acid (HF) or phosphoric acid (H3PO4)] and roughness of porcelain surface (glazed or deglazed) within mouth-like environment.Materials and Methods: Eighty glazed ceramic disks were randomly divided into 8 groups of 10 disks: group 1 [HF+SILANE], group 2 [deglazed+HF+SILANE], group 3 [HF], group 4 [deglazed+HF], group 5 [H3PO4+SILANE], group 6 [deglazed+H3PO4+SILANE], group 7 [H3PO4], group 8 [deglazed+H3PO4]. Then the brackets were bonded and thermocycled. After that, shear bond strength test was done using the Zwick device and the type of bond failure was determined under stereomicroscope at 4X magnification.3-way ANOVA and Kruskal-Wallis were used for statistical analyses.Results: The shear bond strength for the test groups were as follows: group (1): 13.05±7.7 MPa, group (2): 25.16±10.66 MPa, group (3): 6.7±5.86 MPa, group (4): 15.39±8.97 MPa, group (5): 12.76±7.91 MPa, group (6): 13.57±7.85 MPa, group (7): 0.54±0.67 MPa, group (8): 9.34±6.52 MPa. The type of bond failure in all groups was adhesive failure except for group 2. No significant difference in the interaction between (glazed or deglazed), (presence or absence of SILANE), and type of acid was found (P>0.05).Conclusion: Under the conditions of this study, the best clinical method was the use of 37% phosphoric acid and SILANE that resulted in the optimal clinical strength and adhesive bond failure.

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